This standard specifies the test method for total organic carbon in electronic grade water. This standard is applicable to the determination of total organic carbon in electronic grade water. GB/T 11446.8-1997 Test method for total organic carbon in electronic grade water GB/T11446.8-1997 Standard download decompression password: www.bzxz.net

GB/T 11446.3-11446.10-1997 GB/T11446.3~11446.10-1997 are respectively GB11446.3-89 "General Rules for Testing Methods of Electronic Grade Water", GB11446.4-89 "Test Methods for Resistivity of Electronic Grade Water", GB11446.5-89 "Atomic Absorption Spectrophotometric Test Methods for Trace Metals in Electronic Grade Water", GB11446.6-89 "Spectrophotometric Test Methods for Trace Silica in Electronic Grade Water", GB11446.7-89 "Ion Chromatographic Test Methods for Trace Ions in Electronic Grade Water", GB11446.8-89 "Test Methods for Total Organic Carbon in Electronic Grade Water", GB11446.9: 89 Instrumental Test Method for Particles in Electronic Grade Water". GB11446.10-89 "Filter Culture Test Method for Total Bacteria in Electronic Grade Water" has been revised.
Since GB/T11446.1 has added technical indicators for the leaving factory of metal nickel, nitrate ions, phosphate ions, and sulfur rubber ions, this standard has added the test methods for the determination of metal nickel by atomic absorption spectrophotometry and the determination of nitrate, phosphate, and sulfate by ion chromatography. The test method for bacteria only uses the filter culture method, and the method for measuring total organic carbon has also been completely rewritten. The general principles of test methods, the method for measuring resistivity, and the method for determining total silicon have all been revised and rewritten. This standard is implemented from the date of implementation, and G13 11446.3~11446.1089.
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is submitted by the Standardization Institute of the Ministry of Electronics Industry. The drafting units of this standard are: Institute of Semiconductors, Chinese Academy of Sciences, and Standardization Institute of the Ministry of Electronics Industry. The main drafters of this standard are: Wen Ruimei, Li Xiaoying, Wang Zaizhong, Xu Xuemin, You Pan, Liu Renzhong, and Xu Xiuxin. ..com1 Scope
National Standard of the People's Republic of China
Test method for total organic carbon in electronic grade water
This standard specifies the test method for total organic carbon in electronic grade water. This standard is applicable to the determination of total organic carbon in electronic grade water. 2 Reference standards
GB/T 11446-8—1997
Replaces GB11446.889
The following standards contain provisions that constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T11446.1—1997 Sub-grade water
GB/T11446.3—1997 General test method for electronic grade water 3 Principle of the method
Add phosphoric acid to the water sample and control pH<2, then the inorganic carbonate decomposes into carbon dioxide: HCO, -+H+---CO, ++H,O
CO,\-+2H+->CO, + +H,O
The concentration of carbon dioxide can be detected by infrared analyzer and the total inorganic carbon content (IC) can be calculated. The same volume of water sample is oxidized by persulfate, and the total carbon (TC) content is detected by infrared analyzer, then the organic carbon (TOC) content is equal to the difference between the total carbon and inorganic carbon content (TOC-TC-IC).
The process of total organic carbon detection is as follows:
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Detector
Approved by the State Administration of Technical Supervision on September 1, 1997 Oxidation
Detector
1 Data processing TOC=TC-IC
Persulfate
Implementation on September 1, 1998
4 Reagents
GB/T11446.8-1997
4.1 Blank water: should comply with GB/T11446.】Electronic grade water EW-1. 4.2 Sodium (potassium) persulfate: ultrapure.
4.385% phosphine acid: high purity.
4.4 Inorganic carbon standard solution: weigh 1.1000g sodium bicarbonate (NaHCO,) and 1.7700g sodium carbonate (Na.Cx) (500℃~600℃) and dissolve in water without carbon dioxide, dilute to 1 1. 4.5 Organic carbon standard solution: weigh 1.000g acetic acid or 0.8500g potassium hydrogen benzene formate in water without carbon dioxide and organic matter, dilute to 1 1.
5 Instruments
5.1 Total organic carbon tester, including carbon dioxide gas detector and recorder. 5.2 Device for preparing water without carbon dioxide, 5.3 Sampler; 5μL, 10μL, 50μL, etc. 5.4 Glassware with complete specifications including volumetric flasks, beakers, pipettes, etc. 6 Analysis steps
6.1 Selection of test conditions: After the instrument is turned on and preheated for 30 minutes, select the working parameters to put the instrument in a stable working state. 6.2 Drawing of working curve: Separate the inorganic carbon and organic carbon standard solutions and prepare a mixed standard solution of inorganic carbon and organic carbon of 0.05mg/L~1.00mg/L. After the instrument baseline is stable, use a syringe to inject carbon-free blank water and standard solution into the reactor in turn. Record the peak height, and plot the inorganic carbon concentration against the peak height and the total carbon concentration against the peak height. Plot 1. Draw the curve. 6.3 Water sample analysis: Analyze the water sample in the same steps as the preparation of the working curve, determine the peak height, and find out the content of inorganic carbon and total carbon in the water sample from the corresponding working curve. The difference between the two is the total organic carbon content in the water sample. The precision and accuracy
For more than 10 100μg/L carbon standard solutions and the same 100g/L carbon standard solution, the relative standard deviation is less than 10%, and the recovery rate is between 80% and 120%. 8 Test report
The format of the test report shall comply with the requirements of Chapter 6 of GB/T11446.3:1097. 9 Precautions
9.1 The standard solution should be prepared and used immediately, and it is not suitable to store it. During use, it is better to cover it with nitrogen. 9.2 The instrument III used should be soaked in detergent for several hours before use, and then soaked in (1+1) hydrochloric acid for several hours to prevent organic contamination.
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